“Novel 2019 Coronavirus Outbreak” through the Eyes of GNSS Signal

Besides the global crisis of the novel COVID-19 outbreak, we have presented the other side towards an environmental perspective. Due to the economic shutdown of major cities, the novel COVID-19 outbreak has significantly influenced air quality in the atmosphere and also affected the tropospheric refraction on Global Navigation Satellite System GNSS signal propagation in the horizontally stratified column. We suggest that GNSS signal propagation and variation in Zenith Tropospheric Delay (ZTD) in the tropospheric column can be used as a proxy for the pollution-monitoring tool in the future. Although we have presented a case study from mainland China, the hypothesis can be tested globally.